round 1,230 kelvins to two significant figures.

Explanation:

Step1: Identify significant figures

The first two significant figures of 1230 are 1 and 2.

Step2: Look at the next digit

The next digit is 3. Since 3 < 5, we do not round up.

Step3: Express in scientific - notation

1230 rounded to 2 significant figures is 1.2×10³.

Answer:

1.2×10³